#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::pin::Pin;
use std::future::Future;
async fn add_one(x: u32) -> u32 {
    x + 1
}
fn boxed_add_one(x: u32) -> Box<dyn Future<Output = u32>> {
    Box::new(add_one(x))
}
fn main() {
    let boxed_fut = boxed_add_one(42);
    let pinned_fut: Pin<Box<_>> = Box::into_pin(boxed_fut);
}